import HtmlGenerator from './htmlgenerator';
export declare class Preprocessor {
    /**
     * The regular expression used to find the templates
     */
    readonly regex: RegExp;
    /**
     * The regular expression used to filter the js code
     */
    readonly filter: RegExp;
    /**
     * Instance of the generator
     */
    readonly generator: HtmlGenerator;
    /**
     * Variables to define before template expansion
     */
    readonly vars: Record<string, any>;
    /**
     * Constructs a new preprocessor with the given variables
     */
    constructor(generator: HtmlGenerator);
    /**
     * Expands the given string by replacing template parameters
     * @param input the string to expand
     * @param file file being expanded if given one
     * @returns input expanded and template vars replaced
     */
    process(input: string, file?: string): string;
    /**
     *
     * @param code the code to execute
     * @param file file being expanded if given one
     * @returns whatever is returned from the code call
     */
    private safeFunction;
}